You should be able to configure a filter from your Blackberry if on a BES:
1. In the Messages folder, select Menu>Options. Select Email Filters.
2. Menu>New.
3. Complete the fields to create a new filter.
4. Menu>Save.
Not sure if any of those fields would include Sent Items though. Worth a shot.
You can also try to talk to your BES hosts/Admin to see if they can do anything for you as well on their end. If you work for a big company like me though you probably can't depend on any help
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